|Publication number||US7932593 B2|
|Application number||US 12/433,852|
|Publication date||Apr 26, 2011|
|Filing date||Apr 30, 2009|
|Priority date||Apr 11, 2005|
|Also published as||US7545031, US20060226528, US20090218675|
|Publication number||12433852, 433852, US 7932593 B2, US 7932593B2, US-B2-7932593, US7932593 B2, US7932593B2|
|Inventors||Hyeog Chan Kwon|
|Original Assignee||Stats Chippac Ltd.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (27), Classifications (27), Legal Events (2)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This is a continuation of U.S. Non Provisional patent application Ser. No. 11/394,363, now U.S. Pat. No. 7,545,031, filed Mar. 30, 2006, which claims the benefit of U.S. Provisional Application No. 60/670,443, filed Apr. 11, 2005, which is hereby incorporated by reference in its entirety.
This invention relates to semiconductor chip packaging and, particularly, to stacked package modules.
One approach to increasing the density of semiconductor functionality in semiconductor chip packages is to stack die, one over another, on a package substrate. Electrical interconnection of the stacked die may be die-to-die and/or die-to-substrate, for example by wire bonding. It is technically difficult and therefore costly to test die prior to assembly in the stacked die package, and some number of “bad” die are expected in the supply. One bad die in a stacked die package can render the entire package bad and, accordingly, significant waste of materials and manufacturing time can inevitably result in the manufacture of stacked die packages, particularly where a larger number of die are stacked in the package. Stacked die packages having as many as four, five or six die are in use. Stacked die packages can be made very thin, even where spacers between adjacent die are required.
Another approach to increasing the density of semiconductor functionality in semiconductor chip packages is to stack packages, one over the other, to form a stacked package module. Each package in the module includes at least one die, affixed to and electrically interconnected with, a substrate. The packages in the stack are electrically interconnected, for example by wire bonds between bond sites on the respective package substrates. This has the advantage that the packages can be fully tested before they are assembled in the stack; “bad” packages are discarded, and only packages testing as “good” are used in the module.
Several elements contribute to the thickness of a typical stacked package module. At a minimum, the thicknesses of the respective substrates and die, and die attach adhesive, contribute. Additionally, where the die in each package are molded (or encapsulated) the mold cap has a thickness typically greater than that of the die, and where the die is wire bonded to the substrate the mold cap must be thick enough to completely cover the wires, plus a tolerance for variation in wire loop height. And typically the package stack is also molded or encapsulated with a module molding, which may add additional thickness.
In products where a limit is imposed on both package footprint and package thickness, such as for example in mobile devices such as cellular telephones, PDAs, digital cameras, and various consumer electronic devices, it is desirable to make packages (or modules) as thin as possible without increasing the footprint beyond the limits.
In one general aspect the invention features semiconductor chip packages having asymmetrically arranged die. Two such packages having complementary arrangements can be stacked, one inverted with respect to the other, such that the two die are situated side-by-side in the space between the two substrates. In some embodiments the die is affixed to its respective substrate using an adhesive, and is electrically interconnected to the substrate by wire bonding; and in some embodiments the die is mounted onto the respective substrate by flip-chip interconnection. The die may be molded.
In another general aspect the invention features multipackage modules including stacked packages, each having asymmetrically arranged die. The packages have complementary asymmetrical arrangements, and one package is inverted with respect to the other in the stack, such that the two die are situated side-by-side in the space between the two substrates. The z-interconnection between adjacent packages is by solder balls, and the solder ball height is sufficient to provide space for the die. Because the die are situated side-by side, the module thickness is reduced.
In another general aspect the invention features methods for making the packages and for making the stacked package modules.
The stackable complementary packages according to the invention can be made using currently available manufacturing equipment and materials and conventional surface mount technologies. The assembly process can be less complex than for modules having packages stacked one over the other, and the resulting thickness profile can be less. Stack thickness in module assemblies is reduced according to the invention, by virtue of the fact that the two die on the two joined complementary packages share the space between the substrates and an additional die and die attach and mold cap thickness is avoided. Manufacturing costs can be reduced according to the invention by performing only a single solder ball reflow for the entire assembly, following alignment of the stacked complementary packages. The individual packages are fully testable.
The invention will now be described in further detail by reference to the drawings, which illustrate alternative embodiments of the invention. The drawings are diagrammatic, showing features of the invention and their relation to other features and structures, and are not made to scale. For improved clarity of presentation, in the FIGS. illustrating embodiments of the invention, elements corresponding to elements shown in other drawings are not all particularly renumbered, although they are all readily identifiable in all the FIGS. Also for clarity of presentation certain features are not shown if the FIGs., where not necessary for an understanding of the invention. For example, the patterned metal layers at the substrate surface are not shown, and the interconnections (wires or bumps) of the die to the substrate are not shown.
According to one aspect of the invention, packages have the die asymmetrically arranged on the substrate. That is, the die is attached (either affixed and wire bonded or mounted in a flip-chip fashion) on a die attach region toward an edge of the substrate, leaving an unoccupied region near the opposite edge of the substrate. In a first configuration, interconnect solder balls are mounted on the die mount side of the substrate; and in a complementary second configuration, solder balls are mounted on the side of the substrate opposite the die mount side. Complementary pairs of packages are stacked, one inverted with respect to the other, and the respective package substrates are electrically interconnected by the solder balls on the package that has solder balls on the die mount side of its substrate. The solder ball height is great enough to provide a standoff between the substrates to accommodate the thickness of the die (and die attach), and the packages are oriented so that the die on the first package is situated in the space between the package substrates over the unoccupied region of the second package substrate.
Turning now to
The die can then be molded, as shown in
Then, as shown in
A complementary package 60 according to an embodiment of the invention, in which the solder balls are mounted on the land side of the substrate, can be made as shown in
Turning now to
The die can then be molded, as shown in
Then, as shown in
Assembly of complementary packages into multipackage modules according to the invention is shown by way of example in
Formation of a unit of joined complementary packages 30 and 60 is shown by way of example in elevational views in
Complementary package pair units, such as unit 80 in
Other embodiments are within the scope of the invention. For example, although the respective die on the complementary packages are illustrated in the FIGs. as having about the same dimensions, the respective die may in other embodiments have different thicknesses or footprints, particularly where the die have different functionalities. And, for example, although the respective substrates in the complementary packages are illustrated in the FIGs. as having the same length and width, the respective substrates may in other embodiments have different footprints. In any event, the unoccupied region of the die mount side of each substrate must be sufficiently large, and must be configured, to accommodate the length and width of the surface of the die or of the molding over the die in the complementary package.
The multipackage modules can be useful in any of a variety of electronic devices, and they can be particularly useful in products where a high device density is desirable, and where there may be limited space within the product to accommodate the dimensions (footprint, thickness) of the device assemblies. Such products include, for example, portable communications devices such as cellular telephones and personal digital assistants, laptop computers, digital cameras, and electronic entertainment products.
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|U.S. Classification||257/690, 257/E23.02, 257/758, 257/782, 257/E23.052, 257/786, 257/766, 257/762, 257/E21.503, 257/686, 257/773, 257/E23.069, 257/E25.013, 257/E25.023, 257/734, 257/E23.085|
|International Classification||H01L23/48, H01L23/498, H01L23/02|
|Cooperative Classification||H01L21/563, H01L25/105, H01L2924/15311, H01L2225/1058, H01L2225/1088, H01L2225/1023, H01L2224/16145|
|Oct 27, 2014||FPAY||Fee payment|
Year of fee payment: 4
|Aug 6, 2015||AS||Assignment|
Owner name: CITICORP INTERNATIONAL LIMITED, AS COMMON SECURITY
Free format text: SECURITY INTEREST;ASSIGNORS:STATS CHIPPAC, INC.;STATS CHIPPAC LTD.;REEL/FRAME:036288/0748
Effective date: 20150806